Fixed type structure unit for restoring lost sand, structure and restoring method

ABSTRACT

The present invention relates to a fixed type structure unit for restoring lost sand, a structure and a restoring method. The lost sand is restored using the Venturi effect by providing a fixed type cover structure unit underwater to restore lost sand due to erosion. Both end parts in a length direction are open and are provided with an inlet part and an outlet part respectively, an erosion part is provided to be open in a bottom part, the height of the cross section is arranged to become higher towards the inlet part along the length direction, and a hollow part through which water flows is provided integrally inside the fixed type cover structure unit.

TECHNICAL FIELD

The present invention relates to a fixed type structure unit forrestoring lost sand, a structure and a restoring method, and moreparticularly, to a fixed type structure unit for restoring lost sandwhich is disposed under water to restore lost sand due to coastalerosion or riverside erosion using the Venturi effect, a structure usingthe same and a restoring method using the same.

BACKGROUND ART

Recently, erosion of the seashore where there are lots of waves raises aproblem. In general, erosion of the seashore has local causes by weatherconditions, such as storms, and long-term causes by continuous waves andthe ebb and flow of the tide. In fact, such erosion carries on in allseasons, and particularly, waves by northwest wind and southwest windgenerated in winter season cause more severe erosion.

In order to prevent coastal erosion, breakwater structures and blockstructures have been generally used.

The breakwater structures are to create fixed temperature sea areas ofwide spaces and protect the shoreline by reducing wave energy of wavestoward the shore, but are insufficient in absorption and dispersion ofwave energy. Moreover, the breakwater structures may cause a seriouserosion by standing waves reflected by being crashed into the breakwaterstructures, and in severe cases, the breakwater structures may collapseto lose their function.

Moreover, the breakwater structures which are constructed to protrude onthe surface of water destroy natural landscape, cause serious waterpollution because seawater stands in a predetermined area, and have badinfluences on the natural ecosystem.

In the meantime, the block structures are disclosed in Korean PatentNos. 10-089552 and 10-1011020. The block structures reduce movement ofsand due to costal erosion because they are accumulated on sand in anarea where erosion occurs. However, the block structures have severaldisadvantages in that it is difficult to install them to, fit to theform of the seabed while a plurality of the block structures are joinedand installed and in that sand existing between the blocks and theseabed is easily swept off by the waves.

DISCLOSURE Technical Problem

Accordingly, the present invention has been made in an effort to solvethe above-mentioned problems occurring in the prior arts, and it is anobject of the present invention to provide a fixed type structure unitfor restoring lost sand which can prevent eroded sand from being sweptaway in the underwater direction and restore the lost sand in the landdirection and is ecofriendly, a structure using the same and a restoringmethod using the same.

Technical Solution

To achieve the above objects, the present invention provides a fixedtype structure unit for restoring lost sand, which is installed underwater to restore sand lost due to coastal erosion or riverside erosion,the fixed type structure unit including: an inlet part and an outletpart which are respectively disposed at both open end portions in thelength direction; and an erosion part which is formed at a lower part tobe opened and has a cross section which becomes higher toward the inletpart in the length direction, wherein a hollow part is disposedintegrally inside the fixed type cover structure unit to restore lostsand using the Venturi effect.

Moreover, the fixed type cover structure unit includes a pair of outerwall parts disposed in the length direction and a cover part forcovering upper portions of the outer wall parts.

Furthermore, the outlet part of the fixed type cover structure unit hasan outflow induction part disposed at an end portion thereof to have apredetermined height, and the inlet part of the fixed type coverstructure unit has an inflow induction part formed to be inclinedoutwardly and downwardly in the length direction.

Additionally, the fixed type cover structure unit has loss preventingparts vertically formed at both width direction ends in the lengthdirection.

In addition, the cross section of the hollow part is formed to have acurvature, and a screw groove is formed on the inner surface of thefixed type cover structure unit so that the hollow part has a screwshape.

Moreover, the fixed type cover structure unit has a plurality of wireholes through which induction wires penetrate.

Furthermore, a sluice is disposed at the outlet part of the fixed typecover structure unit to be opened and closed by a flow of the runningwater.

In another aspect of the present invention, the present inventionprovides a fixed type structure (S) for restoring lost sand which isinstalled under water to restore sand lost due to coastal erosion orriverside erosion, wherein the fixed type cover structure units arecontinuously arranged to be parallel in the length direction.

In a further aspect of the present invention, the present inventionprovides a method for restoring lost sand due to coastal erosion orriverside erosion including the steps of: selecting a restorationposition of the coast or the riverside due to erosion; forming a fixedtype structure by arranging the fixed type cover structure units; andrestoring lost sand using the Venturi effect by the fixed typestructure.

Additionally, the structure forming step includes the steps of:manufacturing the fixed type cover structure units; adjusting the seabedat the position where the fixed type structure will be installed; andcontinuously arranging the fixed type cover structure units to beparallel in the length direction.

In addition, the lost sand restoring step includes the steps of: makingthe running water flow into the inlet part of the fixed type coverstructure unit; eroding sand of the erosion part by the running water,discharging the eroded sand and the running water to the outlet part;and accumulating the eroded sand.

Advantageous Effects

As described above, the fixed type structure unit for restoring lostsand, the structure and the restoring method according to the presentinvention can prevent eroded sand from being swept away in theunderwater direction and restore the lost sand in the land directionusing the Venturi effect.

Moreover, the fixed type structure unit for restoring lost sand, thestructure and the restoring method according to the present inventioncan easily arrange the cover structure units by penetrating theinduction wire into the wire hole.

Furthermore, the fixed type structure unit for restoring lost sand, thestructure and the restoring method according to the present invention isecofriendly because the fixed type structure unit does not block runningwater due to the hollow parts.

DESCRIPTION OF DRAWINGS

FIGS. 1 and 2 are sectional views showing a block structure forpreventing loss of sand according to a prior art.

FIG. 3 is a perspective view showing a fixed type structure unit forrestoring lost sand according to a preferred embodiment of the presentinvention.

FIG. 4 is a perspective view of a fixed type cover structure unitaccording to various embodiments of the present invention.

FIG. 5 is a perspective view showing arrangement of cover structureunits according to a preferred embodiment of the present invention.

FIG. 6 is an enlarged view showing a sluice of the fixed type coverstructure unit according to the present invention.

FIG. 7 is a conceptual diagram of the fixed type structure unit forrestoring lost sand according to the present invention.

FIG. 8 is a schematic diagram showing states before and after a methodfor restoring lost sand using the fixed type structure unit according tothe present invention is carried out;

FIG. 9 is a sectional view showing changes of the method for restoringlost sand as time passes.

FIG. 10 is a block diagram showing the method for restoring lost sandusing the fixed type structure unit according to the present invention.

MODE FOR INVENTION

Reference will now made in detail to the preferred embodiment of thepresent invention with reference to the attached drawings.

As shown in FIGS. 1 to 7, a fixed type cover structure unit (U) which isdisposed under water in order to restore sand lost due to coastalerosion or riverside erosion has the following configuration.

In detail, the fixed type cover structure unit (U) includes: an inletpart 10 and an outlet part 20 which are respectively disposed at bothopen end portions in the length direction; and an erosion part 30 whichis formed at a lower part to be opened and has a cross section whichbecomes higher toward the inlet part 10 in the length direction. Ahollow part (H) is disposed integrally inside the fixed type coverstructure unit (U) to restore lost sand using the Venturi effect.

The Venturi effect means the phenomenon that a flow rate of a fluidincreases at a constricted section of a structure of which thecross-section area is reduced gradually.

In other words, as shown in FIG. 7, the fixed type cover structure unit(U) is manufactured to be gradually reduced in the cross section toinduce an increase of the flow rate of the fluid, thereby positivelyrestoring lost sand.

The running water must be induced to direct to the outlet part 20 fromthe inlet part 10, and so, directions of the inlet part 10 and theoutlet part 20 are determined according to the basic direction of therunning water. In case of seashore or riverside, it is preferable thatthe outlet part 20 be disposed in the land direction.

Moreover, as shown in FIG. 7, the erosion part 30 is disposed at a lowerpart of the fixed type cover structure unit (U) to be opened, so thatsand on the floor is eroded according to the flow of the running waterand the eroded sand is accumulates through the outlet part 20.

Therefore, the Venturi effect can be obtained when the cross-sectionarea of the outlet part 20 becomes narrower than that of the inlet part10. So, the erosion part 30 is formed in such a way that the height ofthe cross section is increased toward the inlet part 10 in the lengthdirection.

In this instance, as shown in FIG. 4, the fixed type cover structureunit (U) can be manufactured to have various sectional shapes, such as arectangular shape, curved shape, a triangular shape, a trapezoidal shapeand so on. Also, the hollow part (H) may be manufactured to have varioussectional shapes according to the sectional shape of the fixed typecover structure unit (U). However, it is obvious that the shape of thehollow part (H) must be formed to cause the Venturi effect.

In the meantime, the fixed type cover structure unit (U) includes a pairof outer wall parts 40 and 40′ disposed in the length direction and acover part 50 for covering upper portions of the outer wall parts 40 and40′.

According to a preferred embodiment of the present invention, the fixedtype cover structure unit (U) has the above-mentioned shape. Meanwhile,it will be understood by those of ordinary skill in the art that theouter wall parts 40 and 40′ may be manufactured to have a diagonal lineshape or a curved line shape besides an erect shape and that the coverpart 50 may be also manufactured to have a curved line shape besides ahorizontal shape.

In the meantime, the outlet part 20 of the fixed type cover structureunit (U) has an outflow induction part 21 disposed at an end portionthereof to have a predetermined height, and the inlet part 10 of thefixed type cover structure unit (U) has an inflow induction part 11formed to be inclined outwardly and downwardly in the length direction.

The outflow induction part 21 serves to induce a continuous flow of therunning water. If the outflow induction part 21 is not formed, there issome problem in flow of the running water due to a sudden increase ofthe flow rate at the outside of the outlet part 20 and an ascendingphenomenon of sand may occur. However, because the running water canflow continuously through the outflow induction part 21, the eroded sandis positively induced toward the outside of the outlet part 20 to beaccumulated.

The inflow induction part 11 is formed to be inclined outwardly anddownwardly to reduce pressure applied to the inlet part 10 and to inducea natural flow of the running water without a sudden change in the flowof the running water.

In the meantime, the fixed type cover structure unit (U) has losspreventing parts 60 and 60′ vertically formed at both width directionends in the length direction.

The loss preventing parts 60 and 60′ are formed to prevent that theeroded sand generated by erosion through the erosion part 30 is notdischarged through the outlet part 20 but discharged out through a lowerportion of the flank of the fixed type cover structure unit (U). It ispreferable that the cross sections of the loss preventing parts 60 and60′ be formed thinner than the fixed type cover structure unit (U), beformed in a wedge shape and be made of a metallic material. The reasonis to insert the loss preventing parts 60 and 60′ into the bottom byself-load.

Meanwhile, as shown in FIG. 4, the cross section of the hollow part (H)is formed to have a curvature, and a screw groove 70 may be formed onthe inner surface of the fixed type cover structure unit (U) so that thehollow part (H) has a screw shape.

The hollow part (H) has the screw shape by the screw groove 70, so thatthe flow of the running water can be induced more positively and erosionto the bottom can be more active.

Additionally, as shown in FIG. 5, the fixed type cover structure unit(U) has a plurality of wire holes 80 through which induction wires (W)penetrate.

The fixed type cover structure units (U) must be arranged continuouslyto be parallel with the neighboring cover structure units (U) in thelength direction when the fixed type cover structure units (U) arearranged. Hence, the fixed type cover structure units (U) requireprecision in working.

Therefore, when the induction wires (W) penetrate the wire holes 80 ofthe fixed type cover structure units (U) and the fixed type coverstructure units (U) naturally move along the induction wires (W), thefixed type cover structure units (U) can be precisely arranged inparallel with the neighboring fixed type cover structure units (U) inthe length direction.

Moreover, as shown in FIG. 6, a sluice 90 is disposed at the outlet part20 of the fixed type cover structure unit (U) to be opened and closed bythe flow of the running water.

The sluice 90 is naturally opened and closed by the flow of the runningwater. In this instance, the sluice 90 is opened when the flow of therunning water heads the land direction, but is closed when the flow ofthe running water heads the underwater direction, so that it preventsbackward movement of sand.

For this, it is preferable that the sluice 90 have a hinge at an upperportion thereof to open and close the sluice 90.

In the meantime, as shown in FIG. 3, a fixed type structure (S)installed under water to restore sand lost by coastal erosion orriverside erosion according to the present invention is installed insuch a way that the fixed type cover structure units (U) arecontinuously arranged to be parallel in the length direction.

In this instance, the fixed type cover structure units (U) may bearranged in various ways, but it is preferable that the fixed type coverstructure units (U) be fixed using the induction wires (W) as describedabove.

Meanwhile, as shown in FIG. 10, a method (M) for restoring lost sand dueto coastal erosion or riverside erosion according to the presentinvention includes the steps of: (S100) selecting a restoration positionof the coast or the riverside due to erosion; (S200) forming a fixedtype structure (S) by arranging the fixed type cover structure units(U); and (S300) restoring lost sand using the Venturi effect by thefixed type structure (S).

The restoration position selecting step (S100) can be carried out insuch a way as to grasp a position which requires restoration usingwell-known means and indicate the position and a range using a buoy.

Furthermore, as shown in FIG. 3, the structure forming step (S200) is astep to form the fixed type structure (S) using the fixed type coverstructure units (U).

As shown in FIG. 7, the lost sand restoring step (S300) is a step topositively erode sand on the floor and discharge and accumulate theeroded sand to the outside of the outlet part 20 using the Venturieffect of the running water.

In this instance, as shown in FIG. 8, the fixed type cover structureunits (U) are generally arranged to be parallel with the direction ofthe coastal line or the riverbank line, and the outlet part 20 heads theland direction.

In detail, the structure forming step (S200) includes the steps of:(S210) manufacturing the fixed type cover structure units (U); (S220)adjusting the seabed at the position where the fixed type structure (S)will be installed; and (S230) continuously arranging the fixed typecover structure units (U) to be Parallel in the length direction.

The structure unit manufacturing step (S210) is carried out on the landclose to the seashore, and it is preferable that the structure unitmanufacturing step (S210) be carried out at a place where a sufficientworking space is secured. The reason is to simplify the process bycarrying the structure units using a crane.

In addition, the seabed adjusting step (S220) must be essentiallyaccompanied to precisely arrange the fixed type cover structure units(U), and may include the step of flatten the floor surface to reduce astair difference between the cover structure units (U).

However, the structure unit manufacturing step (S210) and the seabedadjusting step (S220) can be flexibly regulated in the order accordingto working environments or conditions because the order of the steps(S210) and (S220) is not clear.

In the meantime, the structure unit adjusting step (S230) is the corestep in the process of forming the fixed type structure (S). The fixedtype cover structure units (U) are generally arranged using the crane,but needs precision in the steps because they must be consecutivelyarranged to be parallel with the neighboring cover structure units (U)in the length direction.

In this instance, it is preferable that the fixed type structure units(U) be generally arranged to be Parallel with the coastal line or theriverbank line.

Therefore, as described above, when the induction wires (W) penetratethe wire holes 80 of the fixed type cover structure units (U) tonaturally move the fixed type cover structure units (U) along theinduction wires (W), the fixed type cover structure units (U) can beprecisely arranged to be parallel with the neighboring fixed type coverstructure units (U) in the length direction.

Meanwhile, the lost sand restoring step (S300) includes the steps of:(S310) making the running water flow into the inlet part 10 of the fixedtype cover structure unit (U); (S320) eroding sand of the erosion part30 by the running water; (S330) discharging the eroded sand and therunning water to the outlet part 20; and (S340) accumulating the erodedsand.

As shown in FIG. 7, the lost sand restoring step (S300) is a step ofpositively using the Venturi effect.

In detail, the running water inflow step (S310), the sand eroding step(S320), the running water discharging step (S330) and the sandaccumulating step (S340) of the lost sand restoring step (S300) are notcarried out in consecutive order but carried out simultaneously.However, if the process is subdivided according to the flow of therunning water, the above-mentioned steps are carried out in consecutiveorder.

Meanwhile, FIG. 8 is a schematic diagram showing states before and afterthe method for restoring lost sand using the fixed type structure unitaccording to the present invention is carried out, and FIG. 9 is asectional view showing changes of the method for restoring lost sand astime passes and shows consecutive changes of sand restored from a to das time goes.

That is, sand is consecutively restored in the land direction from aplace adjacent to the fixed type structure (S).

As described above, while the present invention has been particularlyshown and described with reference to exemplary embodiments thereof, itwill be understood by those of ordinary skill in the art that theprotective scope of the present invention is not limited to the aboveembodiments and that various changes and modifications may be madetherein without departing from the technical idea and scope of thepresent invention and such changes and modifications belong to theclaims of the present invention.

INDUSTRIAL APPLICABILITY

The fixed type structure unit for restoring lost sand, the structure andthe restoring method according to the present invention can be used tosolve the problem due to coastal erosion by restoring lost sand due tocoastal erosion or riverbank erosion.

1. A fixed type structure unit (U) for restoring lost sand which isinstalled under water to restore sand lost due to coastal erosion orriverside erosion, the fixed type structure unit (U) comprising: aninlet part (10) and an outlet part (20) which are respectively disposedat both open end portions in the length direction; and an erosion part(30) which is formed at a lower part, to be opened and has a crosssection which becomes higher toward the inlet part (10) in the lengthdirection, wherein a hollow part (H) is disposed integrally inside thefixed type cover structure unit (U) to restore lost sand using theVenturi effect.
 2. The fixed type structure unit according to claim 1,wherein the fixed type cover structure unit (U) comprises a pair ofouter wall parts (40, 40′) disposed in the length direction and a coverpart (50) for covering upper portions of the outer wall parts (40, 40′).3. The fixed type structure unit according to claim 1, wherein theoutlet part (20) of the fixed type cover structure unit (U) has anoutflow induction part (21) disposed at an end portion thereof to have apredetermined height, and the inlet part (10) of the fixed type coverstructure unit (U) has an inflow induction part (11) formed to beinclined outwardly and downwardly in the length direction.
 4. The fixedtype structure unit according to claim 1, wherein the fixed type coverstructure unit (U) has loss preventing parts (60, 60′) vertically formedat both width direction ends in the length direction.
 5. The fixed typestructure unit according to claim 1, wherein the cross section of thehollow part (H) is formed to have a curvature, and a screw groove (70)is formed on the inner surface of the fixed type cover structure unit(U) so that the hollow part (H) has a screw shape.
 6. The fixed typestructure unit according to claim 1, wherein the fixed type coverstructure unit (U) has a plurality of wire holes (80) through whichinduction wires (W) penetrate.
 7. The fixed type structure unitaccording to claim 1, wherein a sluice (90) is disposed at the outletpart (20) of the fixed type cover structure unit (U) to be opened andclosed by a flow of the running water.
 8. A fixed type structure (S) forrestoring lost sand which is installed under water to restore sand lostdue to coastal erosion or riverside erosion, wherein the fixed typecover structure units (U) according to claim 1 are continuously arrangedto be parallel in the length direction.
 9. A method (M) for restoringlost sand due to coastal erosion or riverside erosion comprising thesteps of: (S100) selecting a restoration position of the coast or theriverside due to erosion; (S200) forming a fixed type structure (5) byarranging the fixed type cover structure units (U) according to claim 1;and (S300) restoring lost sand using the Venturi effect by the fixedtype structure (S).
 10. The method according to claim 9, wherein thestructure forming step (S200) comprises the steps of (S210)manufacturing the fixed type cover structure units (U); (S220) adjustingthe seabed at the position where the fixed type structure (S) will beinstalled; and (S230) continuously arranging the fixed type coverstructure units (U) to be parallel in the length direction.
 11. Themethod according to claim 9, wherein the lost sand restoring step (S300)comprises the steps of: (S310) making the running water flow into theinlet part (10) of the fixed type cover structure unit (U); (S320)eroding sand of the erosion part (30) by the running water; (S330)discharging the eroded sand and the running water to the outlet part(20); and (S340) accumulating the eroded sand.